[PSUBS-MAILIST] magnetic base

[Alan via Personal_Submersibles]

Hank,
thinking this through more; if you had your vertical thrusters in a slot that
takes the vertical thrust, then this may impede the detachment of the thruster
if the only force you can apply to the thruster is vertical to break it free from
the magnets. Ie. If a rope is caught in the thruster & you have blown ballasts
then the pull on the rope would be vertical & against the edge of the slot.
   If the magnets were mounted inside the hull & you removed them, then you
would have a lot more chance of getting the thruster to drop off.
Alan

> On 16/07/2019, at 10:37 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hank,
> the magnets in my open underwater motor from Blue Robotics are coated
> with a marine epoxy & are used in seawater.
> There are large free magnets in old microwaves. I have some tiny 1/4"
> neodymium magnets & they magnetise through an inch of wood.
> I would experiment with putting the magnets inside the hull, & having a metal base
> on the thrusters; that way you could assist in the breakaway of the thruster by
> removing the magnets, rather than just rely on pulling power. Additionally  you 
> wouldn't need to paint them  & could experiment more readily with the power by 
> adding & subtracting. Another thought is having magnetic bases that are 
> used for mounting dial gauges; you could turn their switch to remove them.
> Good idea re magnets Hank, hadn't considered that.  
> Alan
> 
>> On 16/07/2019, at 9:10 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan, 
>> Yes I will make a pocket to take the vertical force.  I think since the magnets are so cheap, I will just replace them when they corrode.  Maybe spray them with WD-40.   I did that with my hatch spring and it is amazing how well it worked.
>> Hank
>> 
>> On Monday, July 15, 2019, 3:02:24 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hank,
>> If you could mount them in a slot so that the vertical thrust pushes against the
>> edges of the slot, that would require less power from the magnets. ( you were
>> probably planning that anyway). 
>> Magnets are corrosive so you would have to either coat them or mount them
>> Inside the hull. They should magnetise through the hull if strong enough.
>> If the magnets were mounted inside the hull you may be able to knock them
>> sideways out of the way to help release the thruster.
>> I would have some way of pinning the thrusters during transport, & take the
>> magnets off ( some how ) during storage.
>> One thought is that a powerful electro magnet may help with the removal of
>> the magnets.
>> Alan
>> 
>>> On 16/07/2019, at 8:25 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> Hi All,  I want to make magnetic bases for my vertical thrusters on E3000.  The thrusters are mounted to the hull section that jettisons witch is bad.  I figure the best way to jettison the motors in my case is to mount them with magnets that will break away.  Anyone try this?
>>> Hank
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>> 
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